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 import java.util.ArrayList; 26 import java.util.List; 27 28 /** 29 * @see "https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.13" 30 */ 31 public class LocalVariableTable { 32 33 private final Local[] locals; 34 35 /** 36 * 37 * @param locals array of objects describing local variables. This array is now owned by this 38 * object and must not be mutated by the caller. 39 */ 40 @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `locals`") 41 public LocalVariableTable(Local[] locals) { 42 this.locals = locals; 43 } 44 45 public Local getLocal(int slot, int bci) { 46 Local result = null; 47 for (Local local : locals) { 48 if (local.getSlot() == slot && local.getStartBCI() <= bci && local.getEndBCI() >= bci) { 49 if (result == null) { 50 result = local; 51 } else { 52 throw new IllegalStateException("Locals overlap!"); 53 } 54 } 55 } 56 return result; 57 } 58 59 public Local[] getLocalsAt(int bci) { 60 List<Local> result = new ArrayList<>(); 61 for (Local l : locals) { 62 if (l.getStartBCI() <= bci && bci <= l.getEndBCI()) { 63 result.add(l); 64 } 65 } 66 return result.toArray(new Local[result.size()]); 67 } 68 }