Re: Methods/Fields in scene

["Stephen Andrew Neuendorffer" <neuendor@eecs.berkeley.edu>]

Here's what I use to find methods that are not read...  I have
a transformer that removes such fields 
(ptolemy.copernicus.kernel.UnusedFieldRemover)
along with statements that write to those fields (modulo a null check).
Note that this does not take information from the call graph into account...
Presumably it would be simple to only loop over reachable methods...

        Set unusedFieldSet = new HashSet();
        // Loop over all the actor instance classes and create the set of
        // all fields.
        for (Iterator i = Scene.v().getApplicationClasses().iterator();
             i.hasNext();) {
            SootClass entityClass = (SootClass)i.next();

            unusedFieldSet.addAll(entityClass.getFields());
        }

        // Loop through all the methods and kill all the used fields.
        for (Iterator i = Scene.v().getApplicationClasses().iterator();
             i.hasNext();) {
            SootClass entityClass = (SootClass)i.next();
            for (Iterator methods = entityClass.getMethods().iterator();
                 methods.hasNext();) {
                SootMethod method = (SootMethod)methods.next();
                JimpleBody body = (JimpleBody)method.retrieveActiveBody();
                for(Iterator stmts = body.getUnits().iterator();
                    stmts.hasNext();) {
                    Stmt stmt = (Stmt)stmts.next();
                    for (Iterator boxes = stmt.getUseBoxes().iterator();
                         boxes.hasNext();) {
                        ValueBox box = (ValueBox)boxes.next();
                        Value value = box.getValue();
                        if(value instanceof FieldRef) {
                            Object field = ((FieldRef)value).getField();
                            unusedFieldSet.remove(field);
                        }
                    }
                }
            }
        }



At 08:06 PM 12/11/2002 -0500, Ankush Varma wrote:
> I use invokeGraph.getTransitiveTargetsof(SootMethod) to get a list of all
> methods reachable from a given method. Is there a way to find all reachable
> fields too?
>
> Ankush
>
> -------------------------------------------------
> Ankush Varma
> Ph.D. Student / Graduate Research Assistant
> DSP-CAD Research Group
> Department of Electrical and Computer Engineering
> University of Maryland, College Park.
>
> email:
> ankush@eng.umd.edu
> not_ankush@yahoo.com
>
> Home: 301-439-0438           Office: 301-405-3089
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