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.PUTFIELD; 33 import static org.objectweb.asm.Opcodes.PUTSTATIC; 34 import static org.objectweb.asm.Opcodes.RETURN; 35 36 /** 37 * Identifies simple setters. A simple setter is a method obtaining a value with a "simple" code and 38 * assigning a field with it. 39 * @see Utils#isSimpleInstruction(int) 40 */ 41 public class Setters implements BiPredicate<ClassNode, MethodNode> { 42 @Override 43 public boolean test(ClassNode clazz, MethodNode m) { 44 int index = 0; 45 int opCode = -1; 46 //skip all instructions allowed to get values 47 for(; index < m.instructions.size(); index++) { 48 opCode = m.instructions.get(index).getOpcode(); 49 if(opCode >=0) { 50 if (!Utils.isSimpleInstruction(opCode)) { 51 break; 52 } 53 } 54 } 55 //that should be an instruction setting a field 56 if(opCode != PUTFIELD && opCode != PUTSTATIC) { 57 return false; 58 } 59 //find next 60 for(index++; index < m.instructions.size(); index++) { 61 opCode = m.instructions.get(index).getOpcode(); 62 if(opCode >=0) { 63 if (!Utils.isSimpleInstruction(opCode)) { 64 break; 65 } 66 } 67 } 68 //and that should be a return 69 return opCode == RETURN; 70 } 71 }