package soot.jimple.toolkits.thread.mhp;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 1997 - 2018 Raja Vallée-Rai and others
 * %%
 * 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
 * <http://www.gnu.org/licenses/lgpl-2.1.html>.
 * #L%
 */

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import soot.jimple.toolkits.thread.mhp.stmt.JPegStmt;
import soot.tagkit.Tag;
import soot.util.Chain;

// *** USE AT YOUR OWN RISK ***
// May Happen in Parallel (MHP) analysis by Lin Li.
// This code should be treated as beta-quality code.
// It was written in 2003, but not incorporated into Soot until 2006.
// As such, it may contain incorrect assumptions about the usage
// of certain Soot classes.
// Some portions of this MHP analysis have been quality-checked, and are
// now used by the Transactions toolkit.
//
// -Richard L. Halpert, 2006-11-30

public class LoopFinder {
  private final Map<Chain, Set<Set<Object>>> chainToLoop = new HashMap<Chain, Set<Set<Object>>>();

  LoopFinder(PegGraph peg) {
    Chain chain = peg.getMainPegChain();
    DfsForBackEdge dfsForBackEdge = new DfsForBackEdge(chain, peg);
    Map<Object, Object> backEdges = dfsForBackEdge.getBackEdges();
    LoopBodyFinder lbf = new LoopBodyFinder(backEdges, peg);
    Set<Set<Object>> loopBody = lbf.getLoopBody();
    testLoops(loopBody);
    chainToLoop.put(chain, loopBody);

  }

  private void testLoops(Set<Set<Object>> loopBody) {
    System.out.println("====loops===");
    Iterator<Set<Object>> it = loopBody.iterator();
    while (it.hasNext()) {
      Set loop = it.next();
      Iterator loopIt = loop.iterator();
      System.out.println("---loop---");
      while (loopIt.hasNext()) {
        JPegStmt o = (JPegStmt) loopIt.next();
        Tag tag = (Tag) o.getTags().get(0);
        System.out.println(tag + " " + o);
      }
    }
    System.out.println("===end===loops===");
  }

}
