1 /* 2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.meta; 24 25 /** 26 * Maps bytecode indexes to source line numbers. 27 * 28 * @see "https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.12" 29 */ 30 public class LineNumberTable { 31 32 private final int[] lineNumbers; 33 private final int[] bci; 34 35 /** 36 * 37 * @param lineNumbers an array or source line numbers. This array is now owned by this object 38 * and should not be mutated by the caller. 39 * @param bci an array of bytecode indexes the same length at {@code lineNumbers} whose entries 40 * are sorted in ascending order. This array is now owned by this object and must not 41 * be mutated by the caller. 42 */ 43 @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `lineNumbers` and `bcis`") 44 public LineNumberTable(int[] lineNumbers, int[] bci) { 45 assert bci.length == lineNumbers.length; 46 this.lineNumbers = lineNumbers; 47 this.bci = bci; 48 } 49 50 /** 51 * Gets a source line number for {@code atBci}. 52 */ 53 public int getLineNumber(int atBci) { 54 for (int i = 0; i < this.bci.length - 1; i++) { 55 if (this.bci[i] <= atBci && atBci < this.bci[i + 1]) { 56 return lineNumbers[i]; 57 } 58 } 59 return lineNumbers[lineNumbers.length - 1]; 60 } 61 }