Instruction22x.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 Instruction22x 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, int regB) { 42 if (regA >= 1 << 8) { 43 throw new RuntimeException("The register number must be less than v16"); 44 } 45 46 if (regB >= 1 << 16) { 47 throw new RuntimeException("The register number must be less than v65536"); 48 } 49 50 out.writeByte(opcode.value); 51 out.writeByte(regA); 52 out.writeShort(regB); 53 } 54 55 private Instruction22x(Opcode opcode, byte[] buffer, int bufferIndex) { 56 super(opcode, buffer, bufferIndex); 57 } 58 59 public Format getFormat() { 60 return Format.Format22x; 61 } 62 63 public int getRegisterA() { 64 return NumberUtils.decodeUnsignedByte(buffer[bufferIndex + 1]); 65 } 66 67 public int getRegisterB() { 68 return NumberUtils.decodeUnsignedShort(buffer, bufferIndex + 2); 69 } 70 71 private static class Factory implements Instruction.InstructionFactory { 72 public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 73 return new Instruction22x(opcode, buffer, bufferIndex); 74 } 75 } 76} 77