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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.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     public static final Instruction.InstructionFactory Factory = new Factory();
     42     private byte regA;
     43     private byte regB;
     44 
     45     public Instruction22c(Opcode opcode, byte regA, byte regB, Item referencedItem) {
     46         super(opcode, referencedItem);
     47 
     48         if (regA >= 1 << 4 ||
     49                 regB >= 1 << 4) {
     50             throw new RuntimeException("The register number must be less than v16");
     51         }
     52 
     53         this.regA = regA;
     54         this.regB = regB;
     55     }
     56 
     57     private Instruction22c(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
     58         super(dexFile, opcode, buffer, bufferIndex);
     59 
     60         this.regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]);
     61         this.regB = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 1]);
     62     }
     63 
     64     protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
     65         out.writeByte(opcode.value);
     66         out.writeByte((regB << 4) | regA);
     67         out.writeShort(getReferencedItem().getIndex());
     68     }
     69 
     70     public Format getFormat() {
     71         return Format.Format22c;
     72     }
     73 
     74     public int getRegisterA() {
     75         return regA;
     76     }
     77 
     78     public int getRegisterB() {
     79         return regB;
     80     }
     81 
     82     private static class Factory implements Instruction.InstructionFactory {
     83         public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
     84             return new Instruction22c(dexFile, opcode, buffer, bufferIndex);
     85         }
     86     }
     87 }
     88