[Soot-list] Def Use analysis on Groovy Classes (Bytecode)

[Pauline Anthonysamy]

Hello Everyone,

I implemented a method which generates def - use chain for a method. 
Below is my method:

private HashMap<Integer, HashSet<Integer>> getDUChains(SootMethod m) {
         HashMap<Integer, HashSet<Integer>> duChains = new 
HashMap<Integer, HashSet<Integer>>();

         Body b = m.retrieveActiveBody();
         UnitGraph graph = new CompleteUnitGraph(b);
         SimpleLiveLocals s = new SimpleLiveLocals(graph);

         Iterator<Unit> gIt = graph.iterator();

         // generate du-pairs
         while (gIt.hasNext()) {
             Unit defUnit = gIt.next();

             SmartLocalDefs des = new SmartLocalDefs(graph, s); // defs 
of local variables
             SimpleLocalUses uses = new SimpleLocalUses(graph, des);

             List<UnitValueBoxPair> ul = uses.getUsesOf(defUnit);
             if (ul != null && ul.size() != 0) {
                 // defs in this unit have some uses
*int defLine = 
Integer.parseInt(defUnit.getTag("LineNumberTag").toString());*
                 HashSet<Integer> useLines = duChains.get(defLine); // 
save my use lines
                 if (useLines == null) {
                     useLines = new HashSet<Integer>();
                 }

                 // all uses lines here
                 for (UnitValueBoxPair vbp : ul) {
                     String use = 
vbp.getUnit().getTag("LineNumberTag").toString(); //
                     useLines.add(Integer.parseInt(use));
                 }

                 duChains.put(defLine, useLines);
             }
         }
         return duChains;
     }


The method works for Java classes but not on Groovy as the 
"defUnit.getTag("LineNumberTag").toString()" throws a 
NullPointerException. I remember reading somewhere that Groovy Bytecode 
does not keep the source code line numbers. Is this true? If yes, is 
there a way to get pass this? I am not sure how I can proceed from here. 
Any help would be very much appreciated!

Many Thanks,
-Pauline

-- 
Pauline Anthonysamy
PhD Candidate

Lancaster University
Lancaster, United Kingdom

Email: anthonys at comp.lancs.ac.uk
Phone: +44 (01524) 510346
WWW:   http://www.comp.lancs.ac.uk/~anthonys


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