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      1 /*
      2  * Copyright 2011, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 package org.jf.dexlib.Code.Format;
     33 
     34 import org.jf.dexlib.Code.Instruction;
     35 import org.jf.dexlib.Code.InstructionWithReference;
     36 import org.jf.dexlib.Code.Opcode;
     37 import org.jf.dexlib.Code.SingleRegisterInstruction;
     38 import org.jf.dexlib.DexFile;
     39 import org.jf.dexlib.Item;
     40 import org.jf.dexlib.TypeIdItem;
     41 import org.jf.dexlib.Util.AnnotatedOutput;
     42 import org.jf.dexlib.Util.NumberUtils;
     43 
     44 public class Instruction41c extends InstructionWithJumboReference implements SingleRegisterInstruction {
     45     public static final InstructionFactory Factory = new Factory();
     46     private short regA;
     47 
     48     public Instruction41c(Opcode opcode, int regA, Item referencedItem) {
     49         super(opcode, referencedItem);
     50 
     51         if (regA >= 1 << 16) {
     52             throw new RuntimeException("The register number must be less than v65536");
     53         }
     54 
     55         if (opcode == Opcode.NEW_INSTANCE_JUMBO) {
     56             assert referencedItem instanceof TypeIdItem;
     57             if (((TypeIdItem)referencedItem).getTypeDescriptor().charAt(0) != 'L') {
     58                 throw new RuntimeException("Only class references can be used with the new-instance/jumbo opcode");
     59             }
     60         }
     61 
     62         this.regA = (short)regA;
     63     }
     64 
     65     private Instruction41c(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
     66         super(dexFile, opcode, buffer, bufferIndex);
     67 
     68         if (opcode == Opcode.NEW_INSTANCE_JUMBO &&
     69                 ((TypeIdItem)this.getReferencedItem()).getTypeDescriptor().charAt(0) != 'L') {
     70 
     71             throw new RuntimeException("Only class references can be used with the new-instance/jumbo opcode");
     72         }
     73 
     74         this.regA = (short)NumberUtils.decodeUnsignedShort(buffer, bufferIndex + 6);
     75     }
     76 
     77     protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
     78         out.writeByte(0xFF);
     79         out.writeByte(opcode.value);
     80         out.writeInt(getReferencedItem().getIndex());
     81         out.writeShort(getRegisterA());
     82     }
     83 
     84     public Format getFormat() {
     85         return Format.Format41c;
     86     }
     87 
     88     public int getRegisterA() {
     89         return regA & 0xFFFF;
     90     }
     91 
     92     private static class Factory implements InstructionFactory {
     93         public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
     94             return new Instruction41c(dexFile, opcode, buffer, bufferIndex);
     95         }
     96     }
     97 }
     98