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; 30 31 import org.jf.dexlib.Code.Format.*; 32 import org.jf.dexlib.DexFile; 33 import org.jf.dexlib.Util.ExceptionWithContext; 34 import org.jf.dexlib.Util.Hex; 35 36 public class InstructionIterator { IterateInstructions(DexFile dexFile, byte[] insns, ProcessInstructionDelegate delegate)37 public static void IterateInstructions(DexFile dexFile, byte[] insns, ProcessInstructionDelegate delegate) { 38 int insnsPosition = 0; 39 40 while (insnsPosition < insns.length) { 41 try 42 { 43 short opcodeValue = (short)(insns[insnsPosition] & 0xFF); 44 if (opcodeValue == 0xFF) { 45 opcodeValue = (short)((0xFF << 8) | insns[insnsPosition+1]); 46 } 47 48 Opcode opcode = Opcode.getOpcodeByValue(opcodeValue); 49 50 Instruction instruction = null; 51 52 if (opcode == null) { 53 System.err.println(String.format("unknown opcode encountered - %x. Treating as nop.", 54 (opcodeValue & 0xFFFF))); 55 instruction = new UnknownInstruction(opcodeValue); 56 } else { 57 if (opcode == Opcode.NOP) { 58 byte secondByte = insns[insnsPosition + 1]; 59 switch (secondByte) { 60 case 0: 61 { 62 instruction = new Instruction10x(Opcode.NOP, insns, insnsPosition); 63 break; 64 } 65 case 1: 66 { 67 instruction = new PackedSwitchDataPseudoInstruction(insns, insnsPosition); 68 break; 69 } 70 case 2: 71 { 72 instruction = new SparseSwitchDataPseudoInstruction(insns, insnsPosition); 73 break; 74 } 75 case 3: 76 { 77 instruction = new ArrayDataPseudoInstruction(insns, insnsPosition); 78 break; 79 } 80 } 81 } else { 82 instruction = opcode.format.Factory.makeInstruction(dexFile, opcode, insns, insnsPosition); 83 } 84 } 85 86 assert instruction != null; 87 88 delegate.ProcessInstruction(insnsPosition/2, instruction); 89 insnsPosition += instruction.getSize(insnsPosition/2)*2; 90 } catch (Exception ex) { 91 throw ExceptionWithContext.withContext(ex, "Error occured at code address " + insnsPosition * 2); 92 } 93 } 94 } 95 96 public static interface ProcessInstructionDelegate { ProcessInstruction(int codeAddress, Instruction instruction)97 public void ProcessInstruction(int codeAddress, Instruction instruction); 98 } 99 } 100