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TempExpr.java

package edu.ksu.cis.bandera.bofa;

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Bandera, a Java(TM) analysis and transformation toolkit           *
 * Copyright (C) 1999, 2000, 2001                                    *
 * Venkatesh Prasad Ranganath (rvprasad@cis.ksu.edu)                 *
 * All rights reserved.                                              *
 *                                                                   *
 * This work was done as a project in the SAnToS Laboratory,         *
 * Department of Computing and Information Sciences, Kansas State    *
 * University, USA (http://www.cis.ksu.edu/santos).                  *
 * It is understood that any modification not identified as such is  *
 * not covered by the preceding statement.                           *
 *                                                                   *
 * This work is free software; you can redistribute it and/or        *
 * modify it under the terms of the GNU Library General Public       *
 * License as published by the Free Software Foundation; either      *
 * version 2 of the License, or (at your option) any later version.  *
 *                                                                   *
 * This work 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 *
 * Library General Public License for more details.                  *
 *                                                                   *
 * You should have received a copy of the GNU Library General Public *
 * License along with this toolkit; if not, write to the             *
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
 * Boston, MA  02111-1307, USA.                                      *
 *                                                                   *
 * Java is a trademark of Sun Microsystems, Inc.                     *
 *                                                                   *
 * To submit a bug report, send a comment, or get the latest news on *
 * this project and other SAnToS projects, please visit the web-site *
 *                http://www.cis.ksu.edu/santos                      *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

import ca.mcgill.sable.soot.*;
import ca.mcgill.sable.soot.jimple.*;
import ca.mcgill.sable.util.*;
import edu.ksu.cis.bandera.jjjc.CompilationManager;
import java.io.PrintWriter;
import org.apache.log4j.Category;

/**
 * A jimple expression walker.
 *
 * @author 
 * <a href="http://www.cis.ksu.edu/~rvprasad">Venkatesh Prasad Ranganath</a>
 *
 * @version $Name:  $($Revision: 1.1.1.1 $)
 */
class TempExpr extends AbstractJimpleValueSwitch
{
    /**
     * Method enclosing the expression being walked.
     *
     */
    private SootMethod sm;

    /**
     * The analyzer object.
     *
     */
    private Analysis analyser;

    /**
     * Creates a new <code>TempExpr</code> instance.
     *
     */
    TempExpr()
    {
        analyser = Analysis.init();
    }
    /**
     * Triggers the walk.
     *
     * @param v the expression to be walked on.
     */
    void build(Value v)
    {
        v.apply(this);
    }
    /**
     * Handles the case when <code>caseArrayRef</code>s are encountered.
     *
     * @param v object representing the array reference.
     */
    public void caseArrayRef(ArrayRef v)
    {
        print(v, "ARRAYREFERENCE");
    }
    /**
     * Handles the case when <code>caseInstanceFieldRef</code>s are encountered.
     *
     * @param v object representing the instance field reference.
     */
    public void caseInstanceFieldRef(InstanceFieldRef v)
    {
        print(v, "INSTANCEFIELDREFERENCE");
    }
    /**
     * Handles the case when <code>caseInterfaceInvokeExpr</code>s are
     * encountered. 
     *
     * @param v object representing a interface invoke expression.
     */
    public void caseInterfaceInvokeExpr(InterfaceInvokeExpr v)
    {
        print(v, "INTERFACEMETHODINVOCATION");
    }
    /**
     * Handles the case when <code>Local</code>s are encountered.
     *
     * @param v object representing the local.
     */
    public void caseLocal(Local v)
    {
        print(v, "LOCALREFERENCE");
    }
    /**
     * Handles the case when <code>caseParameterRef</code>s are encountered.
     *
     * @param v object representing parameter reference.
     */
    public void caseParameterRef(ParameterRef v)
    {
        print(v, "PARAMETERREFERENCE");
    }
    /**
     * Handles the case when <code>caseSpecialInvokeExpr</code>s are encountered.
     *
     * @param v object representing a special invoke expression.
     */
    public void caseSpecialInvokeExpr(SpecialInvokeExpr v)
    {
        print(v, "SPECIALMETHODINVOCATION");
    }
    /**
     * Handles the case when <code>caseStaticFieldRef</code>s are encountered.
     *
     * @param v object representing static field reference.
     */
    public void caseStaticFieldRef(StaticFieldRef v)
    {
        print(v, "STATICFIELDREFERENCE");
    }
    /**
     * Handles the case when <code>caseThisRef</code>s are encountered.
     *
     * @param v object representing a reference to <code>this</code> variable.
     */
    public void caseThisRef(ThisRef v)
    {
        print(v, "THISREFERENCE");
    }
    /**
     * Handles the case when <code>caseVirtualInvokeExpr</code>s are encountered.
     *
     * @param v object representing a virtual invoke expression.
     */
    public void caseVirtualInvokeExpr(VirtualInvokeExpr v)
    {
        print(v, "VIRTUALMETHODINVOCATION");
    }
    /**
     * Handles cases which we donot intend to handle at this time.
     *
     * @param obj object representing anything.
     */
    public void defaultCase(Object obj)
    {
        System.out.println("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" + 
                           "xxxxxxxxxxxxxxxxxxx");
        System.out.println("TEST: We donot handle " + obj + ".");
        System.out.println("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" + 
                           "xxxxxxxxxxxxxxxxxxx");
    }
    /**
     * Performs initialization before proceeding with walking.
     *
     * @param sm the method enclosing the expression being walked.
     */
    void init(SootMethod sm)
    {
        this.sm = sm;
    }
    /**
     * A generic method to print all information available from the analysis
     * about the given expression.
     *
     * @param v the expression of interest.
     * @param s a parameterizing string.  This just is printed along with the
     * other information.
     */
    void print(Value v, String s)
    {
        Collection values = null;
        boolean b = true;
        Analysis.StmtMethodPair smp = null;
        
        if (!(v instanceof InvokeExpr)) {
            b = analyser.nullReference(v, sm);
            values = analyser.referenceValueSet(v, sm);
        } // end of if (v instanceOf InvokeExpr)
        if (v instanceof NonStaticInvokeExpr) {
            values = analyser.invokeExprResolution((NonStaticInvokeExpr)v, sm);
        } // end of if (v instanceof NonStaticInvokeExpr)
        
        System.out.println("-------------------------------------" + 
                           "-----------------------");
        System.out.println(s + " expression:" + v);
        System.out.println("# VALUES :" + values.size());
        
        for (Iterator t = values.iterator(); t.hasNext();) {
            Object i = t.next();
            if (i instanceof Analysis.ExprStmtMethodTriple) {
                Analysis.ExprStmtMethodTriple a = 
                    (Analysis.ExprStmtMethodTriple)i;
                System.out.println("{VALUE: " + a.getExpr() + 
                                   ", STMT: " + 
                                   a.getStmtMethodPair().getStmt() +
                                   ", Method: " + 
                                   a.getStmtMethodPair().getSootMethod() + 
                                   //  ", TYPE: " + a.getExpr().getClass() + 
                                   "}");
            } else {
                System.out.println("{VALUE: " + i + ", TYPE: " + i.getClass() + 
                                   "}"); 
            } // end of else
        } // end of for ()
        if (b) {
            System.out.println("NULLNESS: Maybe.");
        } // end of if ()
        else {
            System.out.println("NULLNESS: Never.");
        } // end of else
        
        if (v instanceof Local || v instanceof Ref) {
            System.out.println("DEFINE sites:");
            for (Iterator i = analyser.getDefs(v, sm).iterator(); 
                 i.hasNext();) {
                smp = (Analysis.StmtMethodPair)i.next();
                System.out.println(smp.getSootMethod()+ "{" + smp.getStmt() + "}");
            } // end of for
            System.out.println("USE sites:");
            for (Iterator i = analyser.getUses(v, sm).iterator(); 
                 i.hasNext();) {
                smp = (Analysis.StmtMethodPair)i.next();
                System.out.println(smp.getSootMethod() + "{" + smp.getStmt() + 
                                   "}"); 
            } // end of for
        } // end of if (v instanceof Local)
    }
}

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