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.Instruction; 32import org.jf.dexlib.Code.InstructionWithReference; 33import org.jf.dexlib.Code.Opcode; 34import org.jf.dexlib.Code.SingleRegisterInstruction; 35import org.jf.dexlib.DexFile; 36import org.jf.dexlib.Item; 37import org.jf.dexlib.TypeIdItem; 38import org.jf.dexlib.Util.AnnotatedOutput; 39 40public class Instruction21c extends InstructionWithReference implements SingleRegisterInstruction { 41 public static final Instruction.InstructionFactory Factory = new Factory(); 42 private byte regA; 43 44 public Instruction21c(Opcode opcode, short regA, Item referencedItem) { 45 super(opcode, referencedItem); 46 47 if (regA >= 1 << 8) { 48 throw new RuntimeException("The register number must be less than v256"); 49 } 50 51 if (opcode == Opcode.NEW_INSTANCE) { 52 assert referencedItem instanceof TypeIdItem; 53 if (((TypeIdItem)referencedItem).getTypeDescriptor().charAt(0) != 'L') { 54 throw new RuntimeException("Only class references can be used with the new-instance opcode"); 55 } 56 } 57 58 this.regA = (byte)regA; 59 } 60 61 private Instruction21c(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 62 super(dexFile, opcode, buffer, bufferIndex); 63 64 if (opcode == Opcode.NEW_INSTANCE && 65 ((TypeIdItem)this.getReferencedItem()).getTypeDescriptor().charAt(0) != 'L') { 66 67 throw new RuntimeException("Only class references can be used with the new-instance opcode"); 68 } 69 70 this.regA = buffer[bufferIndex + 1]; 71 } 72 73 protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) { 74 if(opcode == Opcode.CONST_STRING && getReferencedItem().getIndex() > 0xFFFF) { 75 throw new RuntimeException("String offset is too large for const-string. Use string-const/jumbo instead."); 76 } 77 78 out.writeByte(opcode.value); 79 out.writeByte(regA); 80 out.writeShort(getReferencedItem().getIndex()); 81 } 82 83 public Format getFormat() { 84 return Format.Format21c; 85 } 86 87 public int getRegisterA() { 88 return regA & 0xFF; 89 } 90 91 private static class Factory implements Instruction.InstructionFactory { 92 public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) { 93 return new Instruction21c(dexFile, opcode, buffer, bufferIndex); 94 } 95 } 96} 97