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

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2003 - 2004 Ondrej Lhotak
 * %%
 * 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.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import soot.jimple.IdentityRef;
import soot.util.Chain;

/**
 * UnitPrinter implementation for representations that have labelled stmts, such as Jimple, Grimp, and Baf
 */
public abstract class LabeledUnitPrinter extends AbstractUnitPrinter {
  /** branch targets **/
  protected Map labels;
  /** for unit references in Phi nodes **/
  protected Map references;

  protected String labelIndent = "\u0020\u0020\u0020\u0020\u0020";

  public LabeledUnitPrinter(Body b) {
    createLabelMaps(b);
  }

  public Map labels() {
    return labels;
  }

  public Map references() {
    return references;
  }

  public abstract void literal(String s);

  public abstract void methodRef(SootMethodRef m);

  public abstract void fieldRef(SootFieldRef f);

  public abstract void identityRef(IdentityRef r);

  public abstract void type(Type t);

  public void unitRef(Unit u, boolean branchTarget) {
    String oldIndent = getIndent();

    // normal case, ie labels
    if (branchTarget) {
      setIndent(labelIndent);
      handleIndent();
      setIndent(oldIndent);
      String label = labels.get(u);
      if (label == null || "".equals(label)) {
        label = "[?= " + u + "]";
      }
      output.append(label);
    }
    // refs to control flow predecessors (for Shimple)
    else {
      String ref = references.get(u);

      if (startOfLine) {
        String newIndent = "(" + ref + ")" + indent.substring(ref.length() + 2);

        setIndent(newIndent);
        handleIndent();
        setIndent(oldIndent);
      } else {
        output.append(ref);
      }
    }
  }

  private void createLabelMaps(Body body) {
    Chain units = body.getUnits();

    labels = new HashMap(units.size() * 2 + 1, 0.7f);
    references = new HashMap(units.size() * 2 + 1, 0.7f);

    // Create statement name table
    Set labelStmts = new HashSet();
    Set refStmts = new HashSet();

    // Build labelStmts and refStmts
    for (UnitBox box : body.getAllUnitBoxes()) {
      Unit stmt = box.getUnit();

      if (box.isBranchTarget()) {
        labelStmts.add(stmt);
      } else {
        refStmts.add(stmt);
      }
    }

    // left side zero padding for all labels
    // this simplifies debugging the jimple code in simple editors, as it
    // avoids the situation where a label is the prefix of another label
    final int maxDigits = 1 + (int) Math.log10(labelStmts.size());
    final String formatString = "label%0" + maxDigits + "d";

    int labelCount = 0;
    int refCount = 0;

    // Traverse the stmts and assign a label if necessary
    for (Unit s : units) {
      if (labelStmts.contains(s)) {
        labels.put(s, String.format(formatString, ++labelCount));
      }

      if (refStmts.contains(s)) {
        references.put(s, Integer.toString(refCount++));
      }
    }
  }
}