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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         InstructionWithJumboVariant {
     42     public static final Instruction.InstructionFactory Factory = new Factory();
     43     private byte regA;
     44     private byte regB;
     45 
     46     public Instruction22c(Opcode opcode, byte regA, byte regB, Item referencedItem) {
     47         super(opcode, referencedItem);
     48 
     49         if (regA >= 1 << 4 ||
     50                 regB >= 1 << 4) {
     51             throw new RuntimeException("The register number must be less than v16");
     52         }
     53 
     54         this.regA = regA;
     55         this.regB = regB;
     56     }
     57 
     58     private Instruction22c(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
     59         super(dexFile, opcode, buffer, bufferIndex);
     60 
     61         this.regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]);
     62         this.regB = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 1]);
     63     }
     64 
     65     protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
     66         if(getReferencedItem().getIndex() > 0xFFFF) {
     67             if (opcode.hasJumboOpcode()) {
     68                 throw new RuntimeException(String.format("%s index is too large. Use the %s instruction instead.",
     69                         opcode.referenceType.name(), opcode.getJumboOpcode().name));
     70             } else {
     71                 throw new RuntimeException(String.format("%s index is too large.", opcode.referenceType.name()));
     72             }
     73         }
     74 
     75         out.writeByte(opcode.value);
     76         out.writeByte((regB << 4) | regA);
     77         out.writeShort(getReferencedItem().getIndex());
     78     }
     79 
     80     public Format getFormat() {
     81         return Format.Format22c;
     82     }
     83 
     84     public int getRegisterA() {
     85         return regA;
     86     }
     87 
     88     public int getRegisterB() {
     89         return regB;
     90     }
     91 
     92     public Instruction makeJumbo() {
     93         Opcode jumboOpcode = opcode.getJumboOpcode();
     94         if (jumboOpcode == null) {
     95             return null;
     96         }
     97 
     98         return new Instruction52c(jumboOpcode, getRegisterA(), getRegisterB(), getReferencedItem());
     99     }
    100 
    101     private static class Factory implements Instruction.InstructionFactory {
    102         public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
    103             return new Instruction22c(dexFile, opcode, buffer, bufferIndex);
    104         }
    105     }
    106 }
    107