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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 org.jf.dexlib2.Opcode;
import org.jf.dexlib2.iface.instruction.Instruction;
import org.jf.dexlib2.iface.instruction.TwoRegisterInstruction;

import soot.ByteType;
import soot.CharType;
import soot.DoubleType;
import soot.FloatType;
import soot.IntType;
import soot.LongType;
import soot.ShortType;
import soot.Type;
import soot.dexpler.DexBody;
import soot.dexpler.IDalvikTyper;
import soot.dexpler.tags.DoubleOpTag;
import soot.dexpler.tags.FloatOpTag;
import soot.dexpler.tags.IntOpTag;
import soot.dexpler.tags.LongOpTag;
import soot.dexpler.typing.DalvikTyper;
import soot.jimple.AssignStmt;
import soot.jimple.CastExpr;
import soot.jimple.Jimple;

public class CastInstruction extends TaggedInstruction {

  public CastInstruction(Instruction instruction, int codeAddress) {
    super(instruction, codeAddress);
  }

  @Override
  public void jimplify(DexBody body) {
    TwoRegisterInstruction i = (TwoRegisterInstruction) instruction;
    int dest = i.getRegisterA();
    int source = i.getRegisterB();
    Type targetType = getTargetType();
    CastExpr cast = Jimple.v().newCastExpr(body.getRegisterLocal(source), targetType);
    AssignStmt assign = Jimple.v().newAssignStmt(body.getRegisterLocal(dest), cast);
    assign.addTag(getTag());
    setUnit(assign);
    addTags(assign);
    body.add(assign);

    if (IDalvikTyper.ENABLE_DVKTYPER) {
      DalvikTyper.v().setType(assign.getLeftOpBox(), cast.getType(), false);
      // DalvikTyper.v().captureAssign((JAssignStmt)assign, op);
    }
  }

  /**
   * Return the appropriate target type for the covered opcodes.
   *
   * Note: the tag represents the original type before the cast. The cast type is not lost in Jimple and can be retrieved by
   * calling the getCastType() method.
   */
  private Type getTargetType() {
    Opcode opcode = instruction.getOpcode();
    switch (opcode) {
      case INT_TO_BYTE:
        setTag(new IntOpTag());
        return ByteType.v();
      case INT_TO_CHAR:
        setTag(new IntOpTag());
        return CharType.v();
      case INT_TO_SHORT:
        setTag(new IntOpTag());
        return ShortType.v();

      case LONG_TO_INT:
        setTag(new LongOpTag());
        return IntType.v();
      case DOUBLE_TO_INT:
        setTag(new DoubleOpTag());
        return IntType.v();
      case FLOAT_TO_INT:
        setTag(new FloatOpTag());
        return IntType.v();

      case INT_TO_LONG:
        setTag(new IntOpTag());
        return LongType.v();
      case DOUBLE_TO_LONG:
        setTag(new DoubleOpTag());
        return LongType.v();
      case FLOAT_TO_LONG:
        setTag(new FloatOpTag());
        return LongType.v();

      case LONG_TO_FLOAT:
        setTag(new LongOpTag());
        return FloatType.v();
      case DOUBLE_TO_FLOAT:
        setTag(new DoubleOpTag());
        return FloatType.v();
      case INT_TO_FLOAT:
        setTag(new IntOpTag());
        return FloatType.v();

      case INT_TO_DOUBLE:
        setTag(new IntOpTag());
        return DoubleType.v();
      case FLOAT_TO_DOUBLE:
        setTag(new FloatOpTag());
        return DoubleType.v();
      case LONG_TO_DOUBLE:
        setTag(new LongOpTag());
        return DoubleType.v();

      default:
        throw new RuntimeException("Invalid Opcode: " + opcode);
    }
  }

  @Override
  boolean overridesRegister(int register) {
    TwoRegisterInstruction i = (TwoRegisterInstruction) instruction;
    int dest = i.getRegisterA();
    return register == dest;
  }

}