Instruction22t.java revision 16a911620ccf7b530b873fb71cf13e8dcb88ad28
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.OffsetInstruction; 34import org.jf.dexlib.Code.TwoRegisterInstruction; 35import org.jf.dexlib.DexFile; 36import org.jf.dexlib.Util.NumberUtils; 37import org.jf.dexlib.Util.AnnotatedOutput; 38 39public class Instruction22t extends Instruction implements OffsetInstruction, TwoRegisterInstruction { 40 public static final Instruction.InstructionFactory Factory = new Factory(); 41 private byte regA; 42 private byte regB; 43 private short targetAddressOffset; 44 45 public Instruction22t(Opcode opcode, byte regA, byte regB, short offC) { 46 super(opcode); 47 48 if (regA >= 16 || 49 regB >= 16) { 50 throw new RuntimeException("The register number must be less than v16"); 51 } 52 53 if (offC == 0) { 54 throw new RuntimeException("The address offset cannot be 0."); 55 } 56 57 this.regA = regA; 58 this.regB = regB; 59 this.targetAddressOffset = offC; 60 } 61 62 private Instruction22t(Opcode opcode, byte[] buffer, int bufferIndex) { 63 super(opcode); 64 65 assert buffer[bufferIndex] == opcode.value; 66 67 regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]); 68 regB = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 1]); 69 targetAddressOffset = NumberUtils.decodeShort(buffer, bufferIndex + 2); 70 71 assert targetAddressOffset != 0; 72 } 73 74 protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) { 75 out.writeByte(opcode.value); 76 out.writeByte((regB << 4) | regA); 77 out.writeShort(targetAddressOffset); 78 } 79 80 public void updateTargetAddressOffset(int targetAddressOffset) { 81 if (targetAddressOffset < -32768 || targetAddressOffset > 32767) { 82 throw new RuntimeException("The address offset " + targetAddressOffset + 83 " is out of range. It must be in [-32768, 32767]"); 84 } 85 if (targetAddressOffset == 0) { 86 throw new RuntimeException("The address offset cannot be 0"); 87 } 88 this.targetAddressOffset = (short)targetAddressOffset; 89 } 90 91 public Format getFormat() { 92 return Format.Format22t; 93 } 94 95 public int getRegisterA() { 96 return regA; 97 } 98 99 public int getRegisterB() { 100 return regB; 101 } 102 103 public int getTargetAddressOffset() { 104 return targetAddressOffset; 105 } 106 107 private static class Factory implements Instruction.InstructionFactory { 108 public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 109 return new Instruction22t(opcode, buffer, bufferIndex); 110 } 111 } 112}