Instruction22b.java revision 5867263eb588f4671400895d1e6b01c01535061b
1/* 2 * [The "BSD licence"] 3 * Copyright (c) 2009 Ben Gruver 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29package org.jf.dexlib.Code.Format; 30 31import org.jf.dexlib.Code.Instruction; 32import org.jf.dexlib.Code.Opcode; 33import org.jf.dexlib.Code.TwoRegisterInstruction; 34import org.jf.dexlib.DexFile; 35import org.jf.dexlib.Util.NumberUtils; 36import org.jf.dexlib.Util.Output; 37 38public class Instruction22b extends Instruction implements TwoRegisterInstruction { 39 public static final Instruction.InstructionFactory Factory = new Factory(); 40 41 public static void emit(Output out, Opcode opcode, short regA, short regB, byte litC) { 42 if (regA >= 1 << 8 || 43 regB >= 1 << 8) { 44 throw new RuntimeException("The register number must be less than v256"); 45 } 46 47 out.writeByte(opcode.value); 48 out.writeByte(regA); 49 out.writeByte(regB); 50 out.writeByte(litC); 51 } 52 53 private Instruction22b(Opcode opcode, byte[] buffer, int bufferIndex) { 54 super(opcode, buffer, bufferIndex); 55 } 56 57 public Format getFormat() { 58 return Format.Format22b; 59 } 60 61 public int getRegisterA() { 62 return NumberUtils.decodeUnsignedByte(buffer[bufferIndex + 1]); 63 } 64 65 public int getRegisterB() { 66 return NumberUtils.decodeUnsignedByte(buffer[bufferIndex + 2]); 67 } 68 69 public byte getLiteral() { 70 return buffer[bufferIndex + 3]; 71 } 72 73 private static class Factory implements Instruction.InstructionFactory { 74 public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 75 return new Instruction22b(opcode, buffer, bufferIndex); 76 } 77 } 78} 79