169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal/* 269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Javassist, a Java-bytecode translator toolkit. 369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Copyright (C) 1999-2007 Shigeru Chiba, and others. All Rights Reserved. 469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * The contents of this file are subject to the Mozilla Public License Version 669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 1.1 (the "License"); you may not use this file except in compliance with 769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the License. Alternatively, the contents of this file may be used under 869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the terms of the GNU Lesser General Public License Version 2.1 or later. 969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 1069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Software distributed under the License is distributed on an "AS IS" basis, 1169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 1269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * for the specific language governing rights and limitations under the 1369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * License. 1469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 1569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalpackage javassist.bytecode.analysis; 1669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 1769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalimport javassist.bytecode.CodeIterator; 1869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalimport javassist.bytecode.Opcode; 1969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 2069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal/** 2169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * A set of common utility methods. 2269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 2369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @author Jason T. Greene 2469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 2569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalpublic class Util implements Opcode { 2669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public static int getJumpTarget(int pos, CodeIterator iter) { 2769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal int opcode = iter.byteAt(pos); 2869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal pos += (opcode == JSR_W || opcode == GOTO_W) ? iter.s32bitAt(pos + 1) : iter.s16bitAt(pos + 1); 2969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return pos; 3069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 3169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 3269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public static boolean isJumpInstruction(int opcode) { 3369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return (opcode >= IFEQ && opcode <= JSR) || opcode == IFNULL || opcode == IFNONNULL || opcode == JSR_W || opcode == GOTO_W; 3469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 3569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 3669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public static boolean isGoto(int opcode) { 3769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return opcode == GOTO || opcode == GOTO_W; 3869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 3969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 4069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public static boolean isJsr(int opcode) { 4169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return opcode == JSR || opcode == JSR_W; 4269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 4369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 4469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public static boolean isReturn(int opcode) { 4569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return (opcode >= IRETURN && opcode <= RETURN); 4669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 4769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal} 48