content: /*
   * [The "BSD licence"]
   * Copyright (c) 2010 Ben Gruver (JesusFreke)
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package org.jf.dexlib.Code.Format;
  
  import org.jf.dexlib.Code.Instruction;
  import org.jf.dexlib.Code.InstructionWithReference;
  import org.jf.dexlib.Code.Opcode;
  import org.jf.dexlib.Code.RegisterRangeInstruction;
  import org.jf.dexlib.DexFile;
  import org.jf.dexlib.Item;
  import org.jf.dexlib.MethodIdItem;
  import org.jf.dexlib.TypeIdItem;
  import org.jf.dexlib.Util.AnnotatedOutput;
  import org.jf.dexlib.Util.NumberUtils;
  
  import static org.jf.dexlib.Code.Opcode.*;
  
  public class Instruction3rc extends InstructionWithReference implements RegisterRangeInstruction {
      public static final Instruction.InstructionFactory Factory = new Factory();
      private byte regCount;
      private short startReg;
  
      public Instruction3rc(Opcode opcode, short regCount, int startReg, Item referencedItem) {
          super(opcode, referencedItem);
  
          if (regCount >= 1 << 8) {
              throw new RuntimeException("regCount must be less than 256");
          }
          if (regCount < 0) {
              throw new RuntimeException("regCount cannot be negative");
          }
  
          if (startReg >= 1 << 16) {
              throw new RuntimeException("The beginning register of the range must be less than 65536");
          }
          if (startReg < 0) {
              throw new RuntimeException("The beginning register of the range cannot be negative");
          }
  
          this.regCount = (byte)regCount;
          this.startReg = (short)startReg;
  
          checkItem(opcode, referencedItem, regCount);
      }
  
      private Instruction3rc(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
          super(dexFile, opcode, buffer, bufferIndex);
  
          this.regCount = (byte)NumberUtils.decodeUnsignedByte(buffer[bufferIndex + 1]);
          this.startReg = (short)NumberUtils.decodeUnsignedShort(buffer, bufferIndex + 4);
  
          checkItem(opcode, getReferencedItem(), getRegCount());
      }
  
      protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
          out.writeByte(opcode.value);
          out.writeByte(regCount);
          out.writeShort(this.getReferencedItem().getIndex());
          out.writeShort(startReg);
      }
  
      public Format getFormat() {
          return Format.Format3rc;
      }
  
      public short getRegCount() {
          return (short)(regCount & 0xFF);
      }
  
      public int getStartRegister() {
          return startReg & 0xFFFF;
      }
  
      private static void checkItem(Opcode opcode, Item item, int regCount) {
          if (opcode == FILLED_NEW_ARRAY_RANGE) {
              //check data for filled-new-array/range opcode
              String type = ((TypeIdItem) item).getTypeDescriptor();
              if (type.charAt(0) != '[') {
                  throw new RuntimeException("The type must be an array type");
              }
              if (type.charAt(1) == 'J' || type.charAt(1) == 'D') {
                  throw new RuntimeException("The type cannot be an array of longs or doubles");
              }
          } else if (opcode.value >= INVOKE_VIRTUAL_RANGE.value && opcode.value <= INVOKE_INTERFACE_RANGE.value) {
              //check data for invoke-*/range opcodes
              MethodIdItem methodIdItem = (MethodIdItem) item;
              int parameterRegisterCount = methodIdItem.getPrototype().getParameterRegisterCount();
              if (opcode != INVOKE_STATIC_RANGE) {
                  parameterRegisterCount++;
              }
              if (parameterRegisterCount != regCount) {
                  throw new RuntimeException("regCount does not match the number of arguments of the method");
              }
          }
      }
  
      private static class Factory implements Instruction.InstructionFactory {
          public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
              return new Instruction3rc(dexFile, opcode, buffer, bufferIndex);
          }
      }
  }
  