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A Java Optimization Framework
There is a newer version: 4.6.0
package soot.jimple.internal;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 1999 Patrick Lam
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import soot.ArrayType;
import soot.Local;
import soot.NullType;
import soot.Type;
import soot.Unit;
import soot.UnitPrinter;
import soot.UnknownType;
import soot.Value;
import soot.ValueBox;
import soot.baf.Baf;
import soot.jimple.ArrayRef;
import soot.jimple.ConvertToBaf;
import soot.jimple.Jimple;
import soot.jimple.JimpleToBafContext;
import soot.jimple.RefSwitch;
import soot.tagkit.Tag;
import soot.util.Switch;

public class JArrayRef implements ArrayRef, ConvertToBaf {
  protected ValueBox baseBox;
  protected ValueBox indexBox;

  public JArrayRef(Value base, Value index) {
    this(Jimple.v().newLocalBox(base), Jimple.v().newImmediateBox(index));
  }

  protected JArrayRef(ValueBox baseBox, ValueBox indexBox) {
    this.baseBox = baseBox;
    this.indexBox = indexBox;
  }

  public Object clone() {
    return new JArrayRef(Jimple.cloneIfNecessary(getBase()), Jimple.cloneIfNecessary(getIndex()));
  }

  public boolean equivTo(Object o) {
    if (o instanceof ArrayRef) {
      return (getBase().equivTo(((ArrayRef) o).getBase()) && getIndex().equivTo(((ArrayRef) o).getIndex()));
    }
    return false;
  }

  /** Returns a hash code for this object, consistent with structural equality. */
  public int equivHashCode() {
    return getBase().equivHashCode() * 101 + getIndex().equivHashCode() + 17;
  }

  public String toString() {
    return baseBox.getValue().toString() + "[" + indexBox.getValue().toString() + "]";
  }

  public void toString(UnitPrinter up) {
    baseBox.toString(up);
    up.literal("[");
    indexBox.toString(up);
    up.literal("]");
  }

  public Value getBase() {
    return baseBox.getValue();
  }

  public void setBase(Local base) {
    baseBox.setValue(base);
  }

  public ValueBox getBaseBox() {
    return baseBox;
  }

  public Value getIndex() {
    return indexBox.getValue();
  }

  public void setIndex(Value index) {
    indexBox.setValue(index);
  }

  public ValueBox getIndexBox() {
    return indexBox;
  }

  public List getUseBoxes() {
    List useBoxes = new ArrayList();

    useBoxes.addAll(baseBox.getValue().getUseBoxes());
    useBoxes.add(baseBox);

    useBoxes.addAll(indexBox.getValue().getUseBoxes());
    useBoxes.add(indexBox);

    return useBoxes;
  }

  public Type getType() {
    Value base = baseBox.getValue();
    Type type = base.getType();

    if (type.equals(UnknownType.v())) {
      return UnknownType.v();
    } else if (type.equals(NullType.v())) {
      return NullType.v();
    } else {
      // use makeArrayType on non-array type references when they propagate to this point.
      // kludge, most likely not correct.
      // may stop spark from complaining when it gets passed phantoms.
      // ideally I'd want to find out just how they manage to get this far.
      ArrayType arrayType;
      if (type instanceof ArrayType) {
        arrayType = (ArrayType) type;
      } else {
        arrayType = (ArrayType) type.makeArrayType();
      }

      if (arrayType.numDimensions == 1) {
        return arrayType.baseType;
      } else {
        return ArrayType.v(arrayType.baseType, arrayType.numDimensions - 1);
      }
    }
  }

  public void apply(Switch sw) {
    ((RefSwitch) sw).caseArrayRef(this);
  }

  public void convertToBaf(JimpleToBafContext context, List out) {
    ((ConvertToBaf) getBase()).convertToBaf(context, out);
    ((ConvertToBaf) getIndex()).convertToBaf(context, out);

    Unit currentUnit = context.getCurrentUnit();

    Unit x;

    out.add(x = Baf.v().newArrayReadInst(getType()));

    Iterator it = currentUnit.getTags().iterator();
    while (it.hasNext()) {
      x.addTag((Tag) it.next());
    }

  }
}