1 /* Soot - a J*va Optimization Framework 2 * Copyright (C) 1997 Clark Verbrugge 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with this library; if not, write to the 16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 17 * Boston, MA 02111-1307, USA. 18 */ 19 20 /* 21 * Modified by the Sable Research Group and others 1997-1999. 22 * See the 'credits' file distributed with Soot for the complete list of 23 * contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot) 24 */ 25 26 27 28 29 30 31 32 package soot.coffi; 33 import java.io.*; 34 /** Instruction subclasses are used to represent parsed bytecode; each 35 * bytecode operation has a corresponding subclass of Instruction. 36 * <p> 37 * Each subclass is derived from one of 38 * <ul><li>Instruction</li> 39 * <li>Instruction_noargs (an Instruction with no embedded arguments)</li> 40 * <li>Instruction_byte (an Instruction with a single byte data argument)</li> 41 * <li>Instruction_bytevar (a byte argument specifying a local variable)</li> 42 * <li>Instruction_byteindex (a byte argument specifying a constant pool index)</li> 43 * <li>Instruction_int (an Instruction with a single short data argument)</li> 44 * <li>Instruction_intvar (a short argument specifying a local variable)</li> 45 * <li>Instruction_intindex (a short argument specifying a constant pool index)</li> 46 * <li>Instruction_intbranch (a short argument specifying a code offset)</li> 47 * <li>Instruction_longbranch (an int argument specifying a code offset)</li> 48 * </ul> 49 * @author Clark Verbrugge 50 * @see Instruction 51 * @see Instruction_noargs 52 * @see Instruction_byte 53 * @see Instruction_bytevar 54 * @see Instruction_byteindex 55 * @see Instruction_int 56 * @see Instruction_intvar 57 * @see Instruction_intindex 58 * @see Instruction_intbranch 59 * @see Instruction_longbranch 60 * @see Instruction_Unknown 61 */ 62 class Instruction_Aconst_null extends Instruction_noargs { 63 public Instruction_Aconst_null() { super((byte)ByteCode.ACONST_NULL); name = "aconst_null"; } 64 } 65