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.AbstractInsnNode; 28 import org.objectweb.asm.tree.InsnList; 29 30 import java.util.Arrays; 31 32 import static org.objectweb.asm.Opcodes.*; 33 34 public class Utils { 35 private final static int[] SIMPLE_INSTRUCTIONS = new int[]{DUP, LDC, 36 BALOAD, CALOAD, AALOAD, DALOAD, FALOAD, IALOAD, SALOAD, 37 ACONST_NULL, 38 ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, 39 LCONST_0, LCONST_1, 40 FCONST_0, FCONST_1, FCONST_2, 41 DCONST_0, DCONST_1, 42 ALOAD, ILOAD, FLOAD, LLOAD, DLOAD, 43 GETFIELD, GETSTATIC, 44 BIPUSH, SIPUSH}; 45 private final static int[] INVOKE_INSTRUCTIONS = new int[]{INVOKEVIRTUAL, INVOKEINTERFACE, INVOKESTATIC, 46 INVOKEDYNAMIC, INVOKESPECIAL}; 47 private final static int[] RETURN_INSTRUCTIONS = new int[]{RETURN, ARETURN, IRETURN, FRETURN, LRETURN, DRETURN}; 48 49 static { 50 Arrays.sort(SIMPLE_INSTRUCTIONS); 51 Arrays.sort(INVOKE_INSTRUCTIONS); 52 Arrays.sort(RETURN_INSTRUCTIONS); 53 } 54 55 public static int countInstructions(InsnList list) { 56 int count = 0; 57 for (int i = 0; i < list.size(); i++) { 58 if (list.get(i).getOpcode() > 0) count++; 59 } 60 return count; 61 } 62 public static AbstractInsnNode getInstruction(InsnList list, int index) { 63 return list.get(getInstructionIndex(list, index)); 64 } 65 public static int getInstructionIndex(InsnList list, int index) { 66 int count = 0; 67 for (int i = 0; i < list.size(); i++) { 68 if (list.get(i).getOpcode() > 0) { 69 if(count == index) return i; 70 count++; 71 } 72 } 73 throw new IllegalStateException(); 74 } 75 76 /** 77 * An instruction is called "simple" if its only effect is to bring values onto the stack from stack, variables, fields, constants, etc. 78 * @param opCode 79 * @return 80 */ 81 public static boolean isSimpleInstruction(int opCode) { 82 return Arrays.binarySearch(SIMPLE_INSTRUCTIONS, opCode) >= 0; 83 } 84 public static boolean isReturnInstruction(int opCode) { 85 return Arrays.binarySearch(RETURN_INSTRUCTIONS, opCode) >= 0; 86 } 87 public static boolean isInvokeInstruction(int opCode) { 88 return Arrays.binarySearch(INVOKE_INSTRUCTIONS, opCode) >= 0; 89 } 90 }