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      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.Opcode;
     33 import org.jf.dexlib.Code.TwoRegisterInstruction;
     34 import org.jf.dexlib.DexFile;
     35 import org.jf.dexlib.Util.AnnotatedOutput;
     36 import org.jf.dexlib.Util.NumberUtils;
     37 
     38 public class Instruction22x extends Instruction implements TwoRegisterInstruction {
     39     public static final Instruction.InstructionFactory Factory = new Factory();
     40     private byte regA;
     41     private short regB;
     42 
     43     public Instruction22x(Opcode opcode, short regA, int regB) {
     44         super(opcode);
     45 
     46         if (regA >= 1 << 8) {
     47             throw new RuntimeException("The register number must be less than v16");
     48         }
     49 
     50         if (regB >= 1 << 16) {
     51             throw new RuntimeException("The register number must be less than v65536");
     52         }
     53 
     54         this.regA = (byte)regA;
     55         this.regB = (short)regB;
     56     }
     57 
     58     private Instruction22x(Opcode opcode, byte[] buffer, int bufferIndex) {
     59         super(opcode);
     60 
     61         this.regA = buffer[bufferIndex + 1];
     62         this.regB = (short)NumberUtils.decodeUnsignedShort(buffer, bufferIndex + 2);
     63     }
     64 
     65     protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
     66         out.writeByte(opcode.value);
     67         out.writeByte(regA);
     68         out.writeShort(regB);
     69     }
     70 
     71     public Format getFormat() {
     72         return Format.Format22x;
     73     }
     74 
     75     public int getRegisterA() {
     76         return regA & 0xFF;
     77     }
     78 
     79     public int getRegisterB() {
     80         return regB & 0xFFFF;
     81     }
     82 
     83     private static class Factory implements Instruction.InstructionFactory {
     84         public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
     85             return new Instruction22x(opcode, buffer, bufferIndex);
     86         }
     87     }
     88 }
     89