/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.bytecode.analysis;
import javassist.bytecode.CodeIterator;
import javassist.bytecode.Opcode;
/**
* A set of common utility methods.
*
* @author Jason T. Greene
*/
public class Util implements Opcode {
public static int getJumpTarget(int pos, CodeIterator iter) {
int opcode = iter.byteAt(pos);
pos += (opcode == JSR_W || opcode == GOTO_W) ? iter.s32bitAt(pos + 1) : iter.s16bitAt(pos + 1);
return pos;
}
public static boolean isJumpInstruction(int opcode) {
return (opcode >= IFEQ && opcode <= JSR) || opcode == IFNULL || opcode == IFNONNULL || opcode == JSR_W || opcode == GOTO_W;
}
public static boolean isGoto(int opcode) {
return opcode == GOTO || opcode == GOTO_W;
}
public static boolean isJsr(int opcode) {
return opcode == JSR || opcode == JSR_W;
}
public static boolean isReturn(int opcode) {
return (opcode >= IRETURN && opcode <= RETURN);
}
}