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

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2003 Jerome Miecznikowski
 * Copyright (C) 2004 - 2005 Nomair A. Naeem
 * %%
 * 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.LinkedList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import soot.dava.internal.SET.SETNode;
import soot.jimple.Stmt;
import soot.util.IterableSet;

public class AugmentedStmt {
  private static final Logger logger = LoggerFactory.getLogger(AugmentedStmt.class);
  public List bpreds, bsuccs, cpreds, csuccs;
  public SETNode myNode;

  private final IterableSet dominators;
  private IterableSet reachers;
  private Stmt s;

  public AugmentedStmt(Stmt s) {
    this.s = s;

    dominators = new IterableSet();
    reachers = new IterableSet();

    reset_PredsSuccs();
  }

  public void set_Stmt(Stmt s) {
    this.s = s;
  }

  public boolean add_BPred(AugmentedStmt bpred) {
    if (!add_CPred(bpred)) {
      return false;
    }

    if (bpreds.contains(bpred)) {
      cpreds.remove(bpred);
      return false;
    }

    bpreds.add(bpred);
    return true;
  }

  public boolean add_BSucc(AugmentedStmt bsucc) {
    if (!add_CSucc(bsucc)) {
      return false;
    }

    if (bsuccs.contains(bsucc)) {
      csuccs.remove(bsucc);
      return false;
    }

    bsuccs.add(bsucc);
    return true;
  }

  public boolean add_CPred(AugmentedStmt cpred) {
    if (!cpreds.contains(cpred)) {
      cpreds.add(cpred);
      return true;
    }

    return false;
  }

  public boolean add_CSucc(AugmentedStmt csucc) {
    if (!csuccs.contains(csucc)) {
      csuccs.add(csucc);
      return true;
    }

    return false;
  }

  public boolean remove_BPred(AugmentedStmt bpred) {
    if (!remove_CPred(bpred)) {
      return false;
    }

    if (bpreds.contains(bpred)) {
      bpreds.remove(bpred);
      return true;
    }

    cpreds.add(bpred);
    return false;
  }

  public boolean remove_BSucc(AugmentedStmt bsucc) {
    if (!remove_CSucc(bsucc)) {
      return false;
    }

    if (bsuccs.contains(bsucc)) {
      bsuccs.remove(bsucc);
      return true;
    }

    csuccs.add(bsucc);
    return false;
  }

  public boolean remove_CPred(AugmentedStmt cpred) {
    if (cpreds.contains(cpred)) {
      cpreds.remove(cpred);
      return true;
    }

    return false;
  }

  public boolean remove_CSucc(AugmentedStmt csucc) {
    if (csuccs.contains(csucc)) {
      csuccs.remove(csucc);
      return true;
    }

    return false;
  }

  public Stmt get_Stmt() {
    return s;
  }

  public IterableSet get_Dominators() {
    return dominators;
  }

  public IterableSet get_Reachers() {
    return reachers;
  }

  public void set_Reachability(IterableSet reachers) {
    this.reachers = reachers;
  }

  public void dump() {
    logger.debug("" + toString());
  }

  public String toString() {
    return "(" + s.toString() + " @ " + hashCode() + ")";
  }

  public void reset_PredsSuccs() {
    bpreds = new LinkedList();
    bsuccs = new LinkedList();
    cpreds = new LinkedList();
    csuccs = new LinkedList();
  }

  public Object clone() {
    return new AugmentedStmt((Stmt) s.clone());
  }
}