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A Java Optimization Framework
There is a newer version: 4.6.0
package soot.dexpler.instructions;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2012 Michael Markert, Frank Hartmann
 *
 * (c) 2012 University of Luxembourg - Interdisciplinary Centre for
 * Security Reliability and Trust (SnT) - All rights reserved
 * Alexandre Bartel
 *
 * %%
 * 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.HashSet;
import java.util.Set;

import org.jf.dexlib2.iface.instruction.Instruction;
import org.jf.dexlib2.iface.instruction.ReferenceInstruction;
import org.jf.dexlib2.iface.instruction.formats.Instruction21c;
import org.jf.dexlib2.iface.reference.TypeReference;

import soot.Local;
import soot.Type;
import soot.dexpler.DexBody;
import soot.dexpler.DexType;
import soot.dexpler.IDalvikTyper;
import soot.dexpler.typing.DalvikTyper;
import soot.jimple.AssignStmt;
import soot.jimple.CastExpr;
import soot.jimple.Jimple;

public class CheckCastInstruction extends DexlibAbstractInstruction {

  public CheckCastInstruction(Instruction instruction, int codeAdress) {
    super(instruction, codeAdress);
  }

  @Override
  public void jimplify(DexBody body) {
    if (!(instruction instanceof Instruction21c)) {
      throw new IllegalArgumentException("Expected Instruction21c but got: " + instruction.getClass());
    }

    Instruction21c checkCastInstr = (Instruction21c) instruction;

    Local castValue = body.getRegisterLocal(checkCastInstr.getRegisterA());
    Type checkCastType = DexType.toSoot((TypeReference) checkCastInstr.getReference());

    CastExpr castExpr = Jimple.v().newCastExpr(castValue, checkCastType);

    // generate "x = (Type) x"
    // splitter will take care of the rest
    AssignStmt assign = Jimple.v().newAssignStmt(castValue, castExpr);

    setUnit(assign);
    addTags(assign);
    body.add(assign);

    if (IDalvikTyper.ENABLE_DVKTYPER) {
      DalvikTyper.v().setType(assign.getLeftOpBox(), checkCastType, false);
    }

  }

  @Override
  public Set introducedTypes() {
    ReferenceInstruction i = (ReferenceInstruction) instruction;

    Set types = new HashSet();
    types.add(DexType.toSoot((TypeReference) i.getReference()));
    return types;
  }
}