// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package org.jetbrains.java.decompiler.code.optinstructions;

import org.jetbrains.java.decompiler.code.Instruction;

import java.io.DataOutputStream;
import java.io.IOException;

public class ALOAD extends Instruction {

  private static final int[] opcodes = new int[]{opc_aload_0, opc_aload_1, opc_aload_2, opc_aload_3};

  public void writeToStream(DataOutputStream out, int offset) throws IOException {
    int index = getOperand(0);
    if (index > 3) {
      if (wide) {
        out.writeByte(opc_wide);
      }
      out.writeByte(opc_aload);
      if (wide) {
        out.writeShort(index);
      }
      else {
        out.writeByte(index);
      }
    }
    else {
      out.writeByte(opcodes[index]);
    }
  }

  public int length() {
    int index = getOperand(0);
    if (index > 3) {
      if (wide) {
        return 4;
      }
      else {
        return 2;
      }
    }
    else {
      return 1;
    }
  }
}