1 /* 2 * [The "BSD licence"] 3 * Copyright (c) 2010 Ben Gruver (JesusFreke) 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 29 package org.jf.dexlib.Code.Format; 30 31 import org.jf.dexlib.Code.Instruction; 32 import org.jf.dexlib.Code.OffsetInstruction; 33 import org.jf.dexlib.Code.Opcode; 34 import org.jf.dexlib.Code.SingleRegisterInstruction; 35 import org.jf.dexlib.DexFile; 36 import org.jf.dexlib.Util.AnnotatedOutput; 37 import org.jf.dexlib.Util.NumberUtils; 38 39 public class Instruction31t extends OffsetInstruction implements SingleRegisterInstruction { 40 public static final Instruction.InstructionFactory Factory = new Factory(); 41 private byte regA; 42 private int targetAddressOffset; 43 44 public Instruction31t(Opcode opcode, short regA, int offB) { 45 super(opcode); 46 47 if (regA >= 1 << 8) { 48 throw new RuntimeException("The register number must be less than v256"); 49 } 50 51 this.regA = (byte)regA; 52 this.targetAddressOffset = offB; 53 } 54 55 private Instruction31t(Opcode opcode, byte[] buffer, int bufferIndex) { 56 super(opcode); 57 58 this.regA = buffer[bufferIndex + 1]; 59 this.targetAddressOffset = NumberUtils.decodeInt(buffer, bufferIndex + 2); 60 } 61 62 protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) { 63 out.writeByte(opcode.value); 64 out.writeByte(regA); 65 //align the address offset so that the absolute address is aligned on a 4-byte boundary (2 code block boundary) 66 out.writeInt(targetAddressOffset + ((currentCodeAddress + targetAddressOffset) % 2)); 67 } 68 69 public void updateTargetAddressOffset(int targetAddressOffset) { 70 this.targetAddressOffset = targetAddressOffset; 71 } 72 73 public Format getFormat() { 74 return Format.Format31t; 75 } 76 77 public int getRegisterA() { 78 return regA & 0xFF; 79 } 80 81 public int getTargetAddressOffset() { 82 return targetAddressOffset; 83 } 84 85 private static class Factory implements Instruction.InstructionFactory { 86 public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 87 return new Instruction31t(opcode, buffer, bufferIndex); 88 } 89 } 90 } 91
