1 /* 2 * Copyright (c) 2018, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package openjdk.jcov.filter.simplemethods; 26 27 import org.objectweb.asm.tree.ClassNode; 28 import org.objectweb.asm.tree.MethodNode; 29 30 import java.util.function.BiPredicate; 31 32 import static org.objectweb.asm.Opcodes.RETURN; 33 34 public class EmptyMethods implements BiPredicate<ClassNode, MethodNode> { 35 @Override 36 public boolean test(ClassNode node, MethodNode m) { 37 int index = 0; 38 int opCode = -1; 39 //skip all instructions allowed to get values 40 for(; index < m.instructions.size(); index++) { 41 opCode = m.instructions.get(index).getOpcode(); 42 if(opCode >=0) { 43 if (!Utils.isSimpleInstruction(opCode)) { 44 break; 45 } 46 } 47 } 48 //that should be a return 49 return opCode == RETURN; 50 } 51 }