/*
* FindBugs - Find Bugs in Java programs
* Copyright (C) 2003-2007 University of Maryland
*
* 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 edu.umd.cs.findbugs.classfile.engine.bcel;
import java.util.Iterator;
import java.util.TreeSet;
import org.apache.bcel.generic.MethodGen;
import edu.umd.cs.findbugs.ba.AnalysisContext;
import edu.umd.cs.findbugs.ba.CFG;
import edu.umd.cs.findbugs.ba.ClassContext;
import edu.umd.cs.findbugs.ba.DepthFirstSearch;
import edu.umd.cs.findbugs.ba.Location;
import edu.umd.cs.findbugs.ba.MethodUnprofitableException;
import edu.umd.cs.findbugs.ba.vna.LoadedFieldSet;
import edu.umd.cs.findbugs.ba.vna.MergeTree;
import edu.umd.cs.findbugs.ba.vna.ValueNumberAnalysis;
import edu.umd.cs.findbugs.ba.vna.ValueNumberDataflow;
import edu.umd.cs.findbugs.classfile.CheckedAnalysisException;
import edu.umd.cs.findbugs.classfile.IAnalysisCache;
import edu.umd.cs.findbugs.classfile.MethodDescriptor;
/**
* Analysis engine to produce ValueNumberDataflow objects for analyzed methods.
*
* @author David Hovemeyer
*/
public class ValueNumberDataflowFactory extends AnalysisFactory<ValueNumberDataflow> {
/**
* Constructor.
*/
public ValueNumberDataflowFactory() {
super("value number analysis", ValueNumberDataflow.class);
}
/*
* (non-Javadoc)
*
* @see
* edu.umd.cs.findbugs.classfile.IAnalysisEngine#analyze(edu.umd.cs.findbugs
* .classfile.IAnalysisCache, java.lang.Object)
*/
@Override
public ValueNumberDataflow analyze(IAnalysisCache analysisCache, MethodDescriptor descriptor) throws CheckedAnalysisException {
MethodGen methodGen = getMethodGen(analysisCache, descriptor);
if (methodGen == null) {
throw new MethodUnprofitableException(descriptor);
}
DepthFirstSearch dfs = getDepthFirstSearch(analysisCache, descriptor);
LoadedFieldSet loadedFieldSet = getLoadedFieldSet(analysisCache, descriptor);
ValueNumberAnalysis analysis = new ValueNumberAnalysis(methodGen, dfs, loadedFieldSet, AnalysisContext
.currentAnalysisContext().getLookupFailureCallback());
analysis.setMergeTree(new MergeTree(analysis.getFactory()));
CFG cfg = getCFG(analysisCache, descriptor);
ValueNumberDataflow vnaDataflow = new ValueNumberDataflow(cfg, analysis);
vnaDataflow.execute();
if (ClassContext.DUMP_DATAFLOW_ANALYSIS) {
TreeSet<Location> tree = new TreeSet<Location>();
for (Iterator<Location> locs = cfg.locationIterator(); locs.hasNext();) {
Location loc = locs.next();
tree.add(loc);
}
System.out.println("\n\nValue number analysis for " + descriptor.getName() + descriptor.getSignature() + " {");
for (Location loc : tree) {
System.out.println("\nBefore: " + vnaDataflow.getFactAtLocation(loc));
System.out.println("Location: " + loc);
System.out.println("After: " + vnaDataflow.getFactAfterLocation(loc));
}
System.out.println("}\n");
}
return vnaDataflow;
}
}