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 }