140 lines
4.3 KiB
Java
140 lines
4.3 KiB
Java
/*
|
|
* This program and the accompanying materials
|
|
* are made available under the terms of the Eclipse Public License v1.0
|
|
* which accompanies this distribution, and is available at
|
|
* http://www.eclipse.org/legal/epl-v10.html.
|
|
*
|
|
* This file is a derivative of code released under the terms listed below.
|
|
*
|
|
*/
|
|
/*
|
|
*
|
|
* Copyright (c) 2009-2012,
|
|
*
|
|
* Adam Fuchs <afuchs@cs.umd.edu>
|
|
* Avik Chaudhuri <avik@cs.umd.edu>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* 3. The names of the contributors may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*
|
|
*/
|
|
|
|
package org.scandroid.prefixtransfer;
|
|
|
|
import java.util.HashMap;
|
|
import java.util.HashSet;
|
|
import java.util.Map.Entry;
|
|
|
|
import com.ibm.wala.fixpoint.AbstractVariable;
|
|
|
|
|
|
public class PrefixVariable extends AbstractVariable<PrefixVariable>{
|
|
|
|
// map instance keys to their prefixes
|
|
public HashMap<Integer, String> knownPrefixes = new HashMap<>();
|
|
public HashSet<Integer> fullPrefixKnown = new HashSet<>();
|
|
|
|
// TODO: keep track of completely known strings (not just known by prefix)
|
|
// HashMap<Integer, String> knownStrings = new HashMap<Integer,String>();
|
|
|
|
public void copyState(PrefixVariable v) {
|
|
knownPrefixes.clear();
|
|
knownPrefixes.putAll(v.knownPrefixes);
|
|
fullPrefixKnown.clear();
|
|
fullPrefixKnown.addAll(v.fullPrefixKnown);
|
|
}
|
|
|
|
public static String intersect(String one, String two)
|
|
{
|
|
int i = 0;
|
|
while(i < one.length() && i < two.length())
|
|
{
|
|
if(one.charAt(i) != two.charAt(i))
|
|
break;
|
|
i++;
|
|
}
|
|
return one.substring(0, i);
|
|
}
|
|
|
|
public String getPrefix(int instance)
|
|
{
|
|
return knownPrefixes.get(instance);
|
|
}
|
|
|
|
public boolean updateAll(PrefixVariable other)
|
|
{
|
|
boolean changed = false;
|
|
for(Entry<Integer,String> e:other.knownPrefixes.entrySet())
|
|
{
|
|
changed = update(e.getKey(),e.getValue()) || changed;
|
|
}
|
|
for (Integer i: other.fullPrefixKnown) {
|
|
changed = include(i) || changed;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
public boolean include(Integer i)
|
|
{
|
|
if (fullPrefixKnown.contains(i)) return false;
|
|
fullPrefixKnown.add(i);
|
|
return true;
|
|
}
|
|
|
|
// set an instance key to have a known prefix
|
|
public boolean update(Integer instance, String prefix)
|
|
{
|
|
String prevPrefix = knownPrefixes.get(instance);
|
|
|
|
if(prevPrefix == null)
|
|
{
|
|
knownPrefixes.put(instance, prefix);
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
String newPrefix = intersect(prevPrefix,prefix);
|
|
if(newPrefix.equals(prevPrefix))
|
|
return false;
|
|
knownPrefixes.put(instance, newPrefix);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
public String toString() {
|
|
return knownPrefixes.toString();
|
|
}
|
|
|
|
// set an instance key to be a particular constant
|
|
// public boolean setConstant(Integer instance, String prefix)
|
|
// {
|
|
// return false;
|
|
// }
|
|
}
|