soot.jimple.toolkits.scalar.FieldStaticnessCorrector Maven / Gradle / Ivy
package soot.jimple.toolkits.scalar;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 1997 - 2018 Raja Vallée-Rai and others
* %%
* This program 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 program 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 General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
import java.util.Iterator;
import java.util.Map;
import soot.Body;
import soot.ConflictingFieldRefException;
import soot.G;
import soot.Singletons;
import soot.SootField;
import soot.Unit;
import soot.jimple.AssignStmt;
import soot.jimple.FieldRef;
import soot.jimple.InstanceFieldRef;
import soot.jimple.Jimple;
import soot.jimple.Stmt;
/**
* Transformer that checks whether a static field is used like an instance field. If this is the case, all instance
* references are replaced by static field references.
*
* @author Steven Arzt
*
*/
public class FieldStaticnessCorrector extends AbstractStaticnessCorrector {
public FieldStaticnessCorrector(Singletons.Global g) {
}
public static FieldStaticnessCorrector v() {
return G.v().soot_jimple_toolkits_scalar_FieldStaticnessCorrector();
}
@Override
protected void internalTransform(Body b, String phaseName, Map options) {
// Some apps reference static fields as instance fields. We need to fix
// this for not breaking the client analysis.
for (Iterator unitIt = b.getUnits().iterator(); unitIt.hasNext();) {
Stmt s = (Stmt) unitIt.next();
if (s.containsFieldRef() && s instanceof AssignStmt) {
FieldRef ref = s.getFieldRef();
// Make sure that the target class has already been loaded
if (isTypeLoaded(ref.getFieldRef().type())) {
try {
if (ref instanceof InstanceFieldRef) {
SootField fld = ref.getField();
if (fld != null && fld.isStatic()) {
AssignStmt assignStmt = (AssignStmt) s;
if (assignStmt.getLeftOp() == ref) {
assignStmt.setLeftOp(Jimple.v().newStaticFieldRef(ref.getField().makeRef()));
} else if (assignStmt.getRightOp() == ref) {
assignStmt.setRightOp(Jimple.v().newStaticFieldRef(ref.getField().makeRef()));
}
}
}
} catch (ConflictingFieldRefException ex) {
// That field is broken, just don't touch it
}
}
}
}
}
}