Typing.java example

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bugvm-master
/* Soot - a J*va Optimization Framework
 * Copyright (C) 2008 Ben Bellamy 
 * 
 * All rights reserved.
 *
 * This library 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 library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
package soot.jimple.toolkits.typing.fast;

import java.util.*;
import soot.*;

/**
 * @author Ben Bellamy
 */
public class Typing
{
	private HashMap<Local, Type> map;
	
	public Typing(Collection<Local> vs)
	{
		this.map = new HashMap<Local, Type>();
		for ( Local v : vs )
			this.map.put(v, BottomType.v());
	}
	
	public Typing(Typing tg)
	{
		this.map = new HashMap<Local, Type>(tg.map);
	}
	
	public Type get(Local v) { return this.map.get(v); }
	
	public Type set(Local v, Type t) { return this.map.put(v, t); }
	
	public String toString()
	{
		StringBuffer sb = new StringBuffer();
		sb.append('{');
		for ( Local v : this.map.keySet() )
		{
			sb.append(v);
			sb.append(':');
			sb.append(this.get(v));
			sb.append(',');
		}
		sb.append('}');
		return sb.toString();
	}
	
	public static void minimize(List<Typing> tgs, IHierarchy h)
	{
		for ( ListIterator<Typing> i = tgs.listIterator(); i.hasNext(); )
		{
			Typing tgi = i.next();
			for ( ListIterator<Typing> j = tgs.listIterator(); j.hasNext(); )
			{
				Typing tgj = j.next();
				if ( tgi != tgj && compare(tgi, tgj, h) == 1 )
				{
					i.remove();
					break;
				}
			}
		}
	}
	
	public static int compare(Typing a, Typing b, IHierarchy h)
	{
		int r = 0;
		for ( Local v : a.map.keySet() )
		{
			Type ta = a.get(v), tb = b.get(v);
			
			int cmp;
			if ( TypeResolver.typesEqual(ta, tb) )
				cmp = 0;
			if ( h.ancestor(ta, tb) )
				cmp = 1;
			else if ( h.ancestor(tb, ta) )
				cmp = -1;
			else
				return -2;
			
			if ( (cmp == 1 && r == -1) || (cmp == -1 && r == 1) )
				return 2;
			if ( r == 0 )
				r = cmp;
		}
		return r;
	}
}