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.InstructionWithReference; 33 import org.jf.dexlib.Code.Opcode; 34 import org.jf.dexlib.Code.TwoRegisterInstruction; 35 import org.jf.dexlib.DexFile; 36 import org.jf.dexlib.Item; 37 import org.jf.dexlib.Util.AnnotatedOutput; 38 import org.jf.dexlib.Util.NumberUtils; 39 40 public class Instruction22c extends InstructionWithReference implements TwoRegisterInstruction, 41 InstructionWithJumboVariant { 42 public static final Instruction.InstructionFactory Factory = new Factory(); 43 private byte regA; 44 private byte regB; 45 46 public Instruction22c(Opcode opcode, byte regA, byte regB, Item referencedItem) { 47 super(opcode, referencedItem); 48 49 if (regA >= 1 << 4 || 50 regB >= 1 << 4) { 51 throw new RuntimeException("The register number must be less than v16"); 52 } 53 54 this.regA = regA; 55 this.regB = regB; 56 } 57 58 private Instruction22c(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 59 super(dexFile, opcode, buffer, bufferIndex); 60 61 this.regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]); 62 this.regB = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 1]); 63 } 64 65 protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) { 66 if(getReferencedItem().getIndex() > 0xFFFF) { 67 if (opcode.hasJumboOpcode()) { 68 throw new RuntimeException(String.format("%s index is too large. Use the %s instruction instead.", 69 opcode.referenceType.name(), opcode.getJumboOpcode().name)); 70 } else { 71 throw new RuntimeException(String.format("%s index is too large.", opcode.referenceType.name())); 72 } 73 } 74 75 out.writeByte(opcode.value); 76 out.writeByte((regB << 4) | regA); 77 out.writeShort(getReferencedItem().getIndex()); 78 } 79 80 public Format getFormat() { 81 return Format.Format22c; 82 } 83 84 public int getRegisterA() { 85 return regA; 86 } 87 88 public int getRegisterB() { 89 return regB; 90 } 91 92 public Instruction makeJumbo() { 93 Opcode jumboOpcode = opcode.getJumboOpcode(); 94 if (jumboOpcode == null) { 95 return null; 96 } 97 98 return new Instruction52c(jumboOpcode, getRegisterA(), getRegisterB(), getReferencedItem()); 99 } 100 101 private static class Factory implements Instruction.InstructionFactory { 102 public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 103 return new Instruction22c(dexFile, opcode, buffer, bufferIndex); 104 } 105 } 106 } 107