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 29package org.jf.dexlib.Code.Format; 30 31import org.jf.dexlib.Code.FiveRegisterInstruction; 32import org.jf.dexlib.Code.Instruction; 33import org.jf.dexlib.Code.InstructionWithReference; 34import org.jf.dexlib.Code.Opcode; 35import org.jf.dexlib.DexFile; 36import org.jf.dexlib.Item; 37import org.jf.dexlib.MethodIdItem; 38import org.jf.dexlib.TypeIdItem; 39import org.jf.dexlib.Util.AnnotatedOutput; 40import org.jf.dexlib.Util.NumberUtils; 41 42import static org.jf.dexlib.Code.Opcode.*; 43 44public class Instruction35c extends InstructionWithReference implements FiveRegisterInstruction { 45 public static final Instruction.InstructionFactory Factory = new Factory(); 46 private byte regCount; 47 private byte regA; 48 private byte regD; 49 private byte regE; 50 private byte regF; 51 private byte regG; 52 53 public Instruction35c(Opcode opcode, int regCount, byte regD, byte regE, byte regF, byte regG, 54 byte regA, Item referencedItem) { 55 super(opcode, referencedItem); 56 57 if (regCount > 5) { 58 throw new RuntimeException("regCount cannot be greater than 5"); 59 } 60 61 if (regD >= 1 << 4 || 62 regE >= 1 << 4 || 63 regF >= 1 << 4 || 64 regG >= 1 << 4 || 65 regA >= 1 << 4) { 66 throw new RuntimeException("All register args must fit in 4 bits"); 67 } 68 69 checkItem(opcode, referencedItem, regCount); 70 71 this.regCount = (byte)regCount; 72 this.regA = regA; 73 this.regD = regD; 74 this.regE = regE; 75 this.regF = regF; 76 this.regG = regG; 77 } 78 79 protected Instruction35c(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 80 super(dexFile, opcode, buffer, bufferIndex); 81 82 this.regCount = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 1]); 83 this.regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]); 84 this.regD = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 4]); 85 this.regE = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 4]); 86 this.regF = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 5]); 87 this.regG = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 5]); 88 89 if (getRegCount() > 5) { 90 throw new RuntimeException("regCount cannot be greater than 5"); 91 } 92 93 checkItem(opcode, getReferencedItem(), getRegCount()); 94 } 95 96 protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) { 97 if(getReferencedItem().getIndex() > 0xFFFF) { 98 if (opcode.hasJumboOpcode()) { 99 throw new RuntimeException(String.format("%s index is too large. Use the %s instruction instead.", 100 opcode.referenceType.name(), opcode.getJumboOpcode().name)); 101 } else { 102 throw new RuntimeException(String.format("%s index is too large.", opcode.referenceType.name())); 103 } 104 } 105 106 out.writeByte(opcode.value); 107 out.writeByte((regCount << 4) | regA); 108 out.writeShort(getReferencedItem().getIndex()); 109 out.writeByte((regE << 4) | regD); 110 out.writeByte((regG << 4) | regF); 111 } 112 113 public Format getFormat() { 114 return Format.Format35c; 115 } 116 117 public int getRegCount() { 118 return regCount; 119 } 120 121 public byte getRegisterA() { 122 return regA; 123 } 124 125 public byte getRegisterD() { 126 return regD; 127 } 128 129 public byte getRegisterE() { 130 return regE; 131 } 132 133 public byte getRegisterF() { 134 return regF; 135 } 136 137 public byte getRegisterG() { 138 return regG; 139 } 140 141 private static void checkItem(Opcode opcode, Item item, int regCount) { 142 if (opcode == FILLED_NEW_ARRAY) { 143 //check data for filled-new-array opcode 144 String type = ((TypeIdItem) item).getTypeDescriptor(); 145 if (type.charAt(0) != '[') { 146 throw new RuntimeException("The type must be an array type"); 147 } 148 if (type.charAt(1) == 'J' || type.charAt(1) == 'D') { 149 throw new RuntimeException("The type cannot be an array of longs or doubles"); 150 } 151 } else if (opcode.value >= INVOKE_VIRTUAL.value && opcode.value <= INVOKE_INTERFACE.value || 152 opcode == INVOKE_DIRECT_EMPTY) { 153 //check data for invoke-* opcodes 154 MethodIdItem methodIdItem = (MethodIdItem) item; 155 int parameterRegisterCount = methodIdItem.getPrototype().getParameterRegisterCount(); 156 if (opcode != INVOKE_STATIC) { 157 parameterRegisterCount++; 158 } 159 if (parameterRegisterCount != regCount) { 160 throw new RuntimeException("regCount does not match the number of arguments of the method"); 161 } 162 } 163 } 164 165 private static class Factory implements Instruction.InstructionFactory { 166 public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 167 return new Instruction35c(dexFile, opcode, buffer, bufferIndex); 168 } 169 } 170}